downgrade android 4.0.3 to 2.3.6, on huawei ascend g300

Hello everyone
as you can see this is my first post, and I came directly here in an act of desperation
Yesterday I made the automatic upgrade of 4.0.3 on my huawei and was the worst crap I did!
i'de like you indicate me how to downgrade to version 2.3.6, from stock
my phone was purchased 1 month and a half and I dont have root access, and dont want to do anything that would undermine the security or equipment guaranty
if someone can help me, I would appreciate very much
Thank you